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AD7923 Datasheet(Hoja de datos) 7 Page - Analog Devices

No. de Pieza. AD7923
Descripción  4-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 16-Lead TSSOP
Descarga  20 Pages
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Fabricante  AD [Analog Devices]
Página de inicio  http://www.analog.com
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AD7923
–7–
REV. 0
TERMINOLOGY
Integral Nonlinearity
This is the maximum deviation from a straight line passing
through the endpoints of the ADC transfer function. The end-
points of the transfer function are zero-scale, a point 1 LSB
below the first code transition, and full-scale, a point 1 LSB
above the last code transition.
Differential Nonlinearity
This is the difference between the measured and the ideal 1 LSB
change between any two adjacent codes in the ADC.
Offset Error
This is the deviation of the first code transition (00 . . . 000) to
(00 . . . 001) from the ideal, i.e., AGND + 1 LSB.
Offset Error Match
This is the difference in offset error between any two channels.
Gain Error
This is the deviation of the last code transition (111 . . . 110) to
(111 . . . 111) from the ideal (i.e., REFIN – 1 LSB) after the
offset error has been adjusted out.
Gain Error Match
This is the difference in Gain Error between any two channels.
Zero Code Error
This applies when using the twos complement output coding
option, in particular to the 2
¥ REFIN input range with –REFIN
to +REFIN biased about the REFIN point. It is the deviation of
the midscale transition (all 0s to all 1s) from the ideal VIN voltage,
i.e., REFIN – 1 LSB.
Zero Code Error Match
This is the difference in Zero Code Error between any two
channels.
Positive Gain Error
This applies when using the twos complement output coding
option, in particular to the 2
¥ REFIN input range with –REFIN
to +REFIN biased about the REFIN point. It is the deviation of
the last code transition (011. . .110) to (011 . . . 111) from the
ideal (i.e., +REFIN – 1 LSB) after the Zero Code Error has been
adjusted out.
Positive Gain Error Match
This is the difference in Positive Gain Error between any two
channels.
Negative Gain Error
This applies when using the twos complement output coding
option, in particular to the 2
¥ REFIN input range with –REFIN
to +REFIN biased about the REFIN point. It is the deviation of
the first code transition (100 . . . 000) to (100 . . . 001) from the
ideal (i.e., –REFIN + 1 LSB) after the Zero Code Error has been
adjusted out.
Negative Gain Error Match
This is the difference in Negative Gain Error between any two
channels.
Channel-to-Channel Isolation
Channel-to-Channel Isolation is a measure of the level of crosstalk
between channels. It is measured by applying a full-scale 400 kHz
sine wave signal to all three nonselected input channels and
determining how much that signal is attenuated in the selected
channel with a 50 kHz signal. The figure is given worst-case
across all four channels for the AD7923.
PSR (Power Supply Rejection)
Variations in power supply will affect the full-scale transition,
but not the converter’s linearity. Power supply rejection is the
maximum change in full-scale transition point due to a change
in power supply voltage from the nominal value. See Typical
Performance Characteristics.
Track-and-Hold Acquisition Time
The track-and-hold amplifier returns into track mode at the end
of conversion. Track-and-hold acquisition time is the time
required for the output of the track-and-hold amplifier to reach
its final value, within
±1 LSB, after the end of conversion.
Signal-to-(Noise + Distortion) Ratio
This is the measured ratio of signal-to-(noise + distortion) at the
output of the A/D converter. The signal is the rms amplitude of
the fundamental. Noise is the sum of all nonfundamental sig-
nals up to half the sampling frequency (fS/2), excluding dc. The
ratio is dependent on the number of quantization levels in the
digitization process; the more levels, the smaller the quantiza-
tion noise. The theoretical signal-to-(noise + distortion) ratio
for an ideal N-bit converter with a sine wave input is given by:
Signal to Noise
Distortion
N
dB
--()
( .
.
)
+=
+
602
176
Thus for a 12-bit converter, this is 74 dB.
Total Harmonic Distortion (THD)
Total harmonic distortion (THD) is the ratio of the rms sum of
harmonics to the fundamental. For the AD7923, it is defined as:
THD dB
VVVVV
V
()
log
=
++++
20
2
2
3
2
4
2
5
2
6
2
1
where V1 is the rms amplitude of the fundamental and V2, V3,
V4, V5, and V6 are the rms amplitudes of the second through the
sixth harmonics.




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